Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e33ecdd3e01d65…

MALICIOUS

PDF

72.8 KB Created: 2021-04-01 07:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4061f0405d8569a64c81952fbbf65785 SHA-1: dcf1dd37f913511bb536823f831878d67c8ddf49 SHA-256: 73e33ecdd3e01d65d119aea5d723f97350297cf137fa69b14fec3b81dce6da75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of external URIs and a link farm heuristic strongly indicates the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=panorama+del+nuevo+testamento+pdf+serie+fe+y+accion PDF link annotation
    • http://particulier-societegenerale.xyz/tripp_trapp_harness_installationnf0nu.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/zuguleruvebiguzutakufegar.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/89956250843.pdfIn PDF document text
    • http://reduslim-shop.site/82874761941eer44.pdfIn PDF document text
    • http://lixedunodawu.22web.org/35251400103.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/79041926235.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/46496600872.pdfIn PDF document text
    • http://fudidudigas.iblogger.org/kilidijijufotanapake.pdfIn PDF document text
    • http://boriroxoxejava.mypressonline.com/vuxubanisejaja.pdfIn PDF document text
    • http://somenem.iblogger.org/77696685012.pdfIn PDF document text
    • http://creditreportfast.info/465933377138ksgu.pdfIn PDF document text
    • http://sexesex.site/treasure_hunters_3rd_booktppen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mimogovudefo.rf.gd/apostrophe_worksheet.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/kofanun.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/tratamiento_bocio_multinodular.pdfIn PDF document text
    • http://zotubune.myartsonline.com/67654405907.pdfIn PDF document text
    • http://nibubatovavav.atwebpages.com/angioedema_hereditario_2020.pdfIn PDF document text
    • http://sizixezaratog.rf.gd/individual_learning_plan_template_for_college_students.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 5464 bytes
SHA-256: 73d384ab31d33780504ebf154f45d22dd000fb6cfdaab8e011c0a0bb09ad3c34
font_01_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 11560 bytes
SHA-256: 2bc319553e8f2a1483e07bd28575b20cf9e9fa454dcf5c790ad39c8953208d74

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